package io.renren.common.utils;

import org.apache.commons.codec.digest.DigestUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;

public class MD5Util {
    public static String getMD5ByFile(String path) {
        File file = new File(path);
        String value = null;
        FileInputStream in = null;
        try {
            in = new FileInputStream(file);
            MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length());
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            md5.update(byteBuffer);
            BigInteger bi = new BigInteger(1, md5.digest());
            value = bi.toString(16);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (null != in) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return value;
    }

    public static String getMD5ByBigFile(String path) {
        String md5 = null;
        try {
            md5 = DigestUtils.md5Hex(new FileInputStream(path));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return md5;
    }
    
    public static String getMD5ByInputStream(InputStream inputStream) {
        String md5 = null;
        try {
            md5 = DigestUtils.md5Hex(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return md5;
    }
}
